Re: [TCML] Modern Marvels

[Quarkster <quarkster@xxxxxxx>]

Jeff -
   
  That's why megohmmeters apply 500, 1KV or even higher voltages when measuring the higher resistance ranges (hundreds of megs to gigaohm range). Of course, what the meter is really measuring is current, so a high-quality multimeter with a 9V battery could be capable of measuring tens of megohms of resistance if it's current-measuring capability is sensitive enough.
   
  Granted, for accurately measuring surface or bulk resistivity you would want to use specially shaped and spaced electrodes that provided more area contact that the typical pointed multimeter probe, and you would actually be measuring "Ohms per square".

  Regards,
  Herr Zapp
  
"Jeff W. Parisse" <workshop@xxxxxxxxxxxxx> wrote:
  The test needs to be at high potential to be valid.

Jeff

----- Original Message ----- 
This is easily proven with a multimeter with a high resistance range (40 
megs or higher), or preferably a megohmmeter capable of measuring up to the 
gigaohm range. Just go around your home and probe various black materials 
(plastic items, vinyl jacket on AC line cords, black spray paint applied to 
paper, etc). You'll find that very few polymeric materials are "conductive" 
in a way that would have any significant affect on high voltage apparatus.

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